20338731 has 24 divisors (see below), whose sum is σ = 34055424. Its totient is φ = 11455920.

The previous prime is 20338709. The next prime is 20338751. The reversal of 20338731 is 13783302.

It is not a de Polignac number, because 20338731 - 2¹³ = 20330539 is a prime.

It is a super-2 number, since 2×20338731² = 827327957380722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20338695 and 20338704.

It is not an unprimeable number, because it can be changed into a prime (20338751) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2200 + ... + 6746.

It is an arithmetic number, because the mean of its divisors is an integer number (1418976).

Almost surely, 2^20338731 is an apocalyptic number.

20338731 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20338731 is a deficient number, since it is larger than the sum of its proper divisors (13716693).

20338731 is a wasteful number, since it uses less digits than its factorization.

20338731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4631 (or 4628 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20338731 is about 4509.8482236102. The cubic root of 20338731 is about 272.9656197900.

The spelling of 20338731 in words is "twenty million, three hundred thirty-eight thousand, seven hundred thirty-one".